Fair Value Measurements (Financial Assets And Liabilities Measured At Fair Value On Recurring Basis) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Mar. 31, 2018
Assets:
Money market funds	$ 156,864	$ 89,767
Trading securities associated with deferred compensation plans	16,315	17,519
Interest rate swap agreements		8,262
Forward foreign currency exchange contracts	540	360
Total financial assets measured and reported at fair value	173,719	115,908
Liabilities:
Guarantees of bank loans to tobacco growers	803	974
Interest rate swap agreements	6,351
Forward foreign currency exchange contracts	386	392
Total financial liabilities measured and reported at fair value	7,540	1,366
Level 1 [Member]
Assets:
Money market funds	0	0
Trading securities associated with deferred compensation plans	16,315	17,519
Forward foreign currency exchange contracts	0	0
Total financial assets measured and reported at fair value	16,315	17,519
Liabilities:
Guarantees of bank loans to tobacco growers	0	0
Interest rate swap agreements	0
Forward foreign currency exchange contracts	0	0
Total financial liabilities measured and reported at fair value	0	0
Level 2 [Member]
Assets:
Money market funds	0	0
Trading securities associated with deferred compensation plans	0	0
Interest rate swap agreements		8,262
Forward foreign currency exchange contracts	540	360
Total financial assets measured and reported at fair value	540	8,622
Liabilities:
Guarantees of bank loans to tobacco growers	0	0
Interest rate swap agreements	6,351
Forward foreign currency exchange contracts	386	392
Total financial liabilities measured and reported at fair value	6,737	392
Level 3 [Member]
Assets:
Money market funds	0	0
Trading securities associated with deferred compensation plans	0	0
Interest rate swap agreements		0
Forward foreign currency exchange contracts	0	0
Total financial assets measured and reported at fair value	0	0
Liabilities:
Guarantees of bank loans to tobacco growers	803	974
Interest rate swap agreements	0
Forward foreign currency exchange contracts	0	0
Total financial liabilities measured and reported at fair value	803	974
Fair Value Measured at Net Asset Value Per Share [Member]
Assets:
Money market funds	156,864	89,767
Trading securities associated with deferred compensation plans	0	0
Interest rate swap agreements		0
Forward foreign currency exchange contracts	0	0
Total financial assets measured and reported at fair value	156,864	89,767
Liabilities:
Guarantees of bank loans to tobacco growers	0	0
Interest rate swap agreements	0
Forward foreign currency exchange contracts	0	0
Total financial liabilities measured and reported at fair value	$ 0	$ 0